冷靜的英文性格可以用 "calm and composed personality" 來描述。這種性格特質通常表現為情緒穩定、不易受外界干擾、能夠在壓力下保持理智和清晰的思維。以下是幾個相關的英文表達：
- Calm and composed - 冷靜且沉著
- Level-headed - 頭腦冷靜的
- Unflappable - 不易驚慌的
- Poised - 鎮定的
- Collected - 泰然自若的
例如，你可以說：
- "She has a calm and composed personality, which makes her an excellent leader in stressful situations."
- "His level-headed approach to problem-solving is highly valued by his team."
這些表達都能很好地描述一個冷靜、理性的性格特質。